I am exactly the same with this.

I am female and 16, almost 17 years old.
I always feel so sleepy, and I get around 7 hours sleep per night.
I often feel dizzy and have a sicky feeling in my stomach, and this only stops if I have something to eat, when I can know for a fact I'm not even hungry. =S

It's really weird actually, and can make me feel like crap at the best of times.